Evidence map›Paper›PMID 33579393›Full record

ArticleKnee surgery & related research2021

Robotic-assisted vs conventional surgery in medial unicompartmental knee arthroplasty: a clinical and radiological study.

Roberto Negrín, Jaime Duboy, Magaly Iñiguez, Nicolás O Reyes, Maximiliano Barahona, Gonzalo Ferrer, Carlos Infante, Nicolás Jabes

Abstract read
In one paragraph

Article in Knee surgery & related research, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 19 papers, 4 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
19citing papers in PubMed, 4 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

19 citing papers in PubMed, 4 syntheses or guidelines pooled it.

  1. Pooled it
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  5. Visual inspection provides precise intraoperative evaluation of tibial slope during unicompartmental knee arthroplasty.Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA · 2026
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  9. Short-term outcomes of robotic versus conventional unicompartmental knee arthroplasty: evidence from a national database.Journal of orthopaedics and traumatology : official journal of the Italian Society of Orthopaedics and Traumatology · 2025
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

8 authors.

Roberto NegrínDepartment of Orthopedics and Traumatology, Clinica Las Condes, Estoril 450, Las Condes, Santiago, Chile.ORCID https://orcid.org/0000-0002-8106-1926
Jaime DuboyDepartment of Orthopedics and Traumatology, Clinica Las Condes, Estoril 450, Las Condes, Santiago, Chile.ORCID https://orcid.org/0000-0003-4842-3806
Magaly IñiguezDepartment of Orthopedics and Traumatology, Clinica Las Condes, Estoril 450, Las Condes, Santiago, Chile.ORCID https://orcid.org/0000-0001-8573-0093
Nicolás O ReyesDepartment of Orthopedics and Traumatology, Clinica Las Condes, Estoril 450, Las Condes, Santiago, Chile. nicoreyesl@gmail.com.ORCID http://orcid.org/0000-0003-4351-3802
Maximiliano BarahonaDepartment of Orthopaedic Surgery, Hospital Clinico de la Universidad de Chile, Santiago, Chile.ORCID https://orcid.org/0000-0001-7878-8625
Gonzalo FerrerDepartment of Orthopedics and Traumatology, Clinica Las Condes, Estoril 450, Las Condes, Santiago, Chile.ORCID https://orcid.org/0000-0003-2005-7154
Carlos InfanteDepartment of Orthopedics and Traumatology, Clinica Las Condes, Estoril 450, Las Condes, Santiago, Chile.ORCID https://orcid.org/0000-0001-8058-6459
Nicolás JabesDepartment of Orthopedics and Traumatology, Clinica Las Condes, Estoril 450, Las Condes, Santiago, Chile.ORCID https://orcid.org/0000-0001-7273-2401

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundThe use of unicompartmental knee arthroplasty (UKA) has increased and new technologies have been developed to improve patient survival and satisfaction, soft tissue balance, alignment, and component size. Robot-assisted systems offer an increase in surgical precision and accuracy. The purpose of this study is to evaluate the precision of component position using five radiological parameters in conventional and robotic-assisted medial UKA using the NAVIO system.

methodsA cohort study was designed for patients who underwent medial UKA between April 2017 and March 2019 in a single center. Patients were allocated in the conventional (UKA-C) or robotic-assisted (UKA-R) group. The variables analyzed were age, gender, affected knee side, length of hospital stay, surgical time, and radiological measurements such as anatomical medial distal femoral angle (aMDFA), anatomical medial proximal tibial angle (aMPTA), tibial slope, the sagittal femoral angle, and the component size. A target was defined for each measurement, and a successful UKA was defined if at least four radiological measures were on target after surgery. Also, patients' reported outcomes were evaluated using the Oxford Knee Score (OKS) and a numeric rating scale (NRS) for pain.

resultsThirty-four patients were included, 18 of them underwent UKA-R. The success rate for UKA in the UKA-R group was 87%; meanwhile, in the UKA-C group this was 28%, this difference was significant and powered (Fisher's exact test, p = 0.001; 1 - β = 0.95). Also, a 5-point difference in favor of the UKA-R group in the median OKS (p = 0.01), and a significantly lower median NRS for pain (p < 0.000) were found after surgery.

conclusionsUKA-R achieved more precision in the radiological parameters' measure in this study. Also, UKA-R has a trend towards a better OKS and a lower NRS for pain at short-term follow-up.

Indexed as

Robotic-assisted surgeryUnicompartmental knee

Identifiers

PMID33579393
PMCPMC7879692

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.